Let's not be naive, there are probably thousands of Canadian workers who use marijuana regularly, both for medical and non-medical reasons. Most of these people are long term users who are just as concerned for their safety as any other employee and they are just as committed to doing a good job as any other employee. They wouldn't pass a US style drug test, but they are not "stoned" to impairment either. Chances are there are people in your workplace that would fit this scenario and you would never guess. Much ado about nothing.